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首页> 外文会议>International Conference on Energy and Environmental Protection >Geochemical Characteristics and Genesis of Volcanic Rocks from Zhangjiakou Formation in the Chaoyang Basin, Western Liaoning
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Geochemical Characteristics and Genesis of Volcanic Rocks from Zhangjiakou Formation in the Chaoyang Basin, Western Liaoning

机译：辽西朝阳盆地张家口地球化学特征与火山岩的成因

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The Zhangjiakou Formation of Late Jurassic is mainly distributed in the Chaoyang basin in Western Liaoning. Zhangjiakou volcanic cycle may be divided into three subcycles. The volcanic rocks of Zhangjiakou Formation mainly consist of rhyolites, trachyte and trachyandesites. The volcanic rocks are characterized by high SiO_2, Al_2O_3, K_2O and Na_2O, and comparatively low MgO and TiO_2 components. σ=1.76-4.34, the average value is 2.59. Chemical composition of volcanic rocks indicates that they belong to the high-K calc-alkaline magmatic serious. The volcanic rocks are obviously enriched in incompatible elements (K, Rb, Sr, Zr, Ba, Pb, Li), and depleted in compatible elements (Ti, Co, Ni, Cr, V). The volcanic rocks is rich in LREE. The spider patterns are the right-incline. There is a slight low Eu negative abnormality and low Ce negative abnormality. The geochemistry characteristic shows that volcanic rocks of Zhangjiakou volcanic cycle were formed in the transitional environment of compressional orogeny and extensional structure. They have the basic characteristics of continental intra-plate volcanic rocks. The volcanic rocks were mainly derived from the crust materials. The lithogenesis take partial melting as a major part.
机译：张家口的侏罗纪形成主要分布在辽西朝阳盆地。张家口火山循环可以分为三个亚单。张家口地层的火山岩主要由流螺栓，颅骨和龟头段组成。火山岩的特征在于高SiO_2，AL_2O_3，K_2O和NA_2O，以及相对低的MgO和TiO_2组件。 σ= 1.76-4.34，平均值为2.59。火山岩的化学成分表明它们属于高k钙碱岩浆严重。火山岩明显富含元素（K，Rb，Sr，Zr，Ba，Pb，Li），并以相容的元素（Ti，Co，Ni，Cr，V）耗尽。火山岩富有荷兰。蜘蛛模式是右倾斜的。欧盟略有低欧盟阴性异常和低CE阴性异常。地球化学特征表明，张家口火山循环的火山岩形成在压缩造山节和延伸结构的过渡环境中。它们具有欧陆式内部火山岩的基本特征。火山岩主要来自地壳材料。岩生成将部分熔化为主要部分。

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